Implemented DynamicMap groupby methods
Implemented DynamicMap groupby methods

vascotenner/holoviews,basnijholt/holoviews,ioam/holoviews,vascotenner/holoviews,basnijholt/holoviews,vascotenner/holoviews,ioam/holoviews,ioam/holoviews,basnijholt/holoviews